- Body-to-bonnet fit
- 2D drawing and available 3D model; flange diameter, bolt circle, locating register and mating-body dimensions.
- Stem & packing
- Stem diameter, packing bore depth/diameter, gland interface, yoke features and required machining tolerances.
- Sealing & service
- Gasket or O-ring arrangement, face finish, design pressure/temperature, mating materials and test requirements.
- Material specification
- Alloy grade, governing material standard, casting condition and any restricted substances.
- Order & acceptance
- Drawing revision, quantity, delivery condition, critical tolerances, inspection methods and required documentation.